主动控制下软土基坑围护结构侧向变形与迎土面土压力演化规律  

Evolution Law of Lateral Deformation of Retaining Structure and Earth Pressure on Soil Surface of Soft Soil Foundation Excavation Under Active Control

作　　者：曹虹 孙九春[1] 王悦 CAO Hong;SUN Jiuchun;WANG Yue(Tengda Construction Group Co.,Ltd.,Shanghai 201204,China)

机构地区：[1]腾达建设集团股份有限公司,上海201204

出　　处：《施工技术（中英文）》2024年第15期94-101,共8页Construction Technology

基　　金：浙江省建设厅科研项目(2023K188)。

摘　　要：基于有限分析和原位试验,对主动控制下采用轴力伺服系统的软土基坑围护结构侧向变形和迎土面土压力演化规律进行分析。研究结果表明,主动控制下基坑迎土面土压力变化与钢支撑施加轴力、围护结构侧向变形有关;主动控制下围护结构侧向变形减小时迎土面土压力增大,土体开挖工况下围护结构侧向变形增大时迎土面土压力减小;轴力对本道钢支撑处围护结构侧向变形和迎土面土压力的影响最大,距离钢支撑越远轴力对二者的影响越小;主动控制下迎土面土压力介于静止土压力与主动土压力之间;软土流变影响下围护结构侧向变形缓慢增大,迎土面土压力变化不明显。Based on finite analysis and in-situ tests,this paper analyzes the lateral deformation of retaining structure and earth pressure on soil surface of soft soil foundation excavation under active control with axial force servo system.The research results show that the change of earth pressure on soil surface of the foundation excavation under active control is related to the axial force of the steel support and the lateral deformation of retaining structure.Earth pressure on soil surface increases when the lateral deformation of retaining structure decreases under the active control,and earth pressure on soil surface decreases when the lateral deformation of retaining structure increases under the soil excavation condition.The axial force has the greatest influence on the lateral deformation of retaining structure at the steel support and the earth pressure on soil surface.The farther away from the steel support,the smaller the influence of the axial force on the two.The earth pressure on soil surface under active control is between the static earth pressure and the active earth pressure.Under the influence of soft soil rheology,the lateral deformation of retaining structure increases slowly,and the earth pressure on soil surface does not change significantly.

关 键 词：基坑 软土 伺服系统 轴力 土压力 变形 

分 类 号：TU94[建筑科学—建筑技术科学]